EL2245C EL2445C December 1995 Rev C

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1 Features 100 MHz gain-bandwidth product Gain-of-2 stable Low supply current (per Amplifier) e 52 ma at V S e g15v Wide supply range e g2v to g18v dual-supply e 25V to 36V single-supply High slew rate e 275 Vms Fast settling e 80 ns to 01% for a 10V step Low differential gain e 002% at A V ea2 R L e 150X Low differential phase e 007 at A V ea2 R L e 150X Stable with unlimited capacitive load Wide output voltage swing e g136v with V S e g15v R L e 1000X e 38V03V with V S ea5v R L e 500X Applications Video amplifier Single-supply amplifier Active filtersintegrators High-speed sample-and-hold High-speed signal processing ADCDAC buffer PulseRF amplifier Pin diode receiver Log amplifier Photo multiplier amplifier Difference amplifier Ordering Information Part No Temp Range Package Outline Duals EL2245CN 0Ctoa75C 8-Pin P-DIP MDP0031 EL2245CS 0Ctoa75C 8-Lead SO MDP0027 Quads EL2445CN 0Ctoa75C 14-Pin P-DIP MDP0031 EL2445CS 0Ctoa75C 14-Lead SO MDP0027 EL2245CEL2445C General Description The EL2245CEL2445C are dual and quad versions of the popular EL2045C They are high speed low power low cost monolithic operational amplifiers built on Elantec s proprietary complementary bipolar process The EL2245CEL2445C are unitygain stable and feature a 275 Vms slew rate and 100 MHz gainbandwidth product while requiring only 52 ma of supply current per amplifier The power supply operating range of the EL2245CEL2445C is from g18v down to as little as g2v For single-supply operation the EL2245CEL2445C operate from 36V down to as little as 25V The excellent power supply operating range of the EL2245CEL2445C makes them an obvious choice for applications on a single a5v or a3v supply The EL2245CEL2445C also feature an extremely wide output voltage swing of g136v with V S e g15v and R L e 1000X At g5v output voltage swing is a wide g38v with R L e 500X and g32v with R L e 150X Furthermore for single-supply operation at a5v output voltage swing is an excellent 03V to 38V with R L e 500X At a gain of a2 the EL2245CEL2445C have a b3 db bandwidth of 100 MHz with a phase margin of 50 They can drive unlimited load capacitance and because of their conventional voltage-feedback topology the EL2245CEL2445C allow the use of reactive or non-linear elements in their feedback network This versatility combined with low cost and 75 ma of outputcurrent drive make the EL2245CEL2445C an ideal choice for price-sensitive applications requiring low power and high speed Elantec products and facilities comply with MIL-I-45208A and other applicable quality specifications For information on Elantec s processing see Elantec document QRA-1 Elantec s Processing Monolithic Integrated Circuits Connection Diagrams EL2245CNCS Dual Note All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication however this data sheet cannot be a controlled document Current revisions if any to these specifications are maintained at the factory and are available upon your request We recommend checking the revision level before finalization of your design documentationno Patent pending 1992 Elantec Inc EL2445CNCS Quad EL2245CEL2445C December 1995 Rev C

2 EL2245CEL2445C Absolute Maximum Ratings (T A e 25C) Supply Voltage (V S ) g18v or 36V Peak Output Current (I OP ) Short-Circuit Protected Output Short-Circuit Duration Infinite (Note 1) Input Voltage (V IN) gv S Differential Input Voltage (dv IN ) g10v Power Dissipation (P D ) Operating Temperature Range (T A ) Operating Junction Temperature (T J ) Storage Temperature (T ST ) See Curves 0Ctoa75C 150C b65c toa150c Important Note All parameters having MinMax specifications are guaranteed The Test Level column indicates the specific device testing actually performed during production and Quality inspection Elantec performs most electrical tests using modern high-speed automatic test equipment specifically the LTX77 Series system Unless otherwise noted all tests are pulsed tests therefore T J et C et A Test Level I II III IV V Test Procedure 100% production tested and QA sample tested per QA test plan QCX % production tested at T A e 25C and QA sample tested at T A e 25C T MAX and T MIN per QA test plan QCX0002 QA sample tested per QA test plan QCX0002 Parameter is guaranteed (but not tested) by Design and Characterization Data Parameter is typical value at T A e 25C for information purposes only DC Electrical Characteristics V S e g15v R L e 1000X unless otherwise specified Parameter Description Condition Temp Min Typ Max Test Level Units V OS Input Offset V S e g15v 25C I mv Voltage T MIN T MAX 60 III mv TCV OS Average Offset (Note 2) Voltage Drift All 100 V mvc I B Input Bias V S e g15v 25C I ma Current T MIN T MAX 92 III ma V S e g5v 25C 28 V ma I OS Input Offset V S e g15v 25C I na Current T MIN T MAX 400 III na TCI OS Average Offset (Note 2) Current Drift V S e g5v 25C 50 V na All 03 V nac A VOL Open-Loop Gain V S e g15vv OUT e g10v R L e 1000X 25C I VV T MIN T MAX 1500 III VV V S e g5v V OUT e g25v R L e 500X 25C 2500 V VV V S e g5v V OUT e g25v R L e 150X 25C 1750 V VV PSRR Power Supply V S e g5v to g15v 25C I db Rejection Ratio T MIN T MAX 60 III db TD is 35in 2

3 EL2245CEL2445C DC Electrical Characteristics V S e g15v R L e 1000X unless otherwise specified Contd Parameter Description Condition Temp Min Typ Max Test Level Units CMRR Common-Mode V CM e g12v V OUT e 0V 25C I db Rejection Ratio T MIN T MAX 70 III db CMIR Common-Mode V S e g15v 25C g140 V V Input Range V S e g5v 25C g42 V V V S ea5v 25C 4201 V V V OUT Output Voltage V S e g15v R L e 1000X 25C g134 g136 I V Swing T MIN T MAX g131 III V V S e g15v R L e 500X 25C g120 g134 I V V S e g5v R L e 500X 25C g34 g38 IV V V S e g5v R L e 150X 25C g32 V V V S ea5v R L e 500X 25C I V T MIN T MAX 3505 III V I SC Output Short 25C I ma Circuit Current T MIN T MAX 35 III ma I S Supply Current V S e g15v No Load 25C 52 7 I ma (Per Amplifier) T MIN 76 III ma T MAX 76 III ma V S e g5v No Load 25C 50 V ma R IN Input Resistance Differential 25C 150 V kx Common-Mode 25C 15 V MX C IN Input Capacitance A V ea110 MHz 25C 10 V pf R OUT Output Resistance A V ea1 25C 50 V mx PSOR Power-Supply Dual-Supply 25C g20 g180 V V Operating Range Single-Supply 25C V V TD is 47in Closed-Loop AC Electrical Characteristics V S e g15v A V ea1 R L e 1000X unless otherwise specified Parameter Description Condition Temp Min Typ Max Test Level Units BW b3 db Bandwidth V S e g15v A V ea2 25C 100 V MHz (V OUT e 04 V PP ) V S e g15v A V eb1 25C 75 V MHz V S e g15v A V ea5 25C 20 V MHz V S e g15v A V ea10 25C 10 V MHz V S e g15v A V ea20 25C 5 V MHz V S e g5v A V ea2 25C 75 V MHz GBWP Gain-Bandwidth Product V S e g15v 25C 100 V MHz V S e g5v 25C 75 V MHz TD is 17in 3

4 EL2245CEL2445C Closed-Loop AC Electrical Characteristics V S e g15v A V ea2 R L e 1000X unless otherwise specified Contd Parameter Description Condition Temp Min Typ Max Test Level Units PM Phase Margin R L e 1kXC L e10 pf 25C 50 V CS Channel Separation f e 5 MHz 25C 85 V db SR Slew Rate (Note 3) V S e g15v R L e 1000X 25C I Vms V S e g5v R L e 500X 25C 200 V Vms FPBW Full-Power Bandwidth V S e g15v 25C I MHz (Note 4) V S e g5v 25C 127 V MHz t r t f Rise Time Fall Time 01V Step 25C 30 V ns OS Overshoot 01V Step 25C 20 V % t PD Propagation Delay 25C 25 V ns t s Settling to a01% V S e g15v 10V Step 25C 80 V ns (A V ea1) V S e g5v 5V Step 25C 60 V ns dg Differential Gain (Note 5) NTSCPAL 25C 002 V % dp Differential Phase (Note 5) NTSCPAL 25C 007 V en Input Noise Voltage 10 khz 25C 150 V nv0hz in Input Noise Current 10 khz 25C 150 V pa0hz CI STAB Load Capacitance Stability A V ea1 25C Infinite V pf Note 1 A heat-sink is required to keep junction temperature below absolute maximum when an output is shorted Note 2 Measured from T MIN to T MAX Note 3 Slew rate is measured on rising edge Note 4 For V S e g15v V OUT e 20 V PP For V S e g5v V OUT e 5 V PP Full-power bandwidth is based on slew rate measurement using FPBW e SR(2q Vpeak) Note 5 Video Performance measured at V S e g15v A V e a2 with 2 times normal video level across R L e 150X This corresponds to standard video levels across a back-terminated 75X load For other values of R L see curves TD is 32in EL2245CEL2445C Test Circuit

5 EL2245CEL2445C Typical Performance Curves (T A e 25C R F e 1kXC F e3 pf R L e 1000X A V ea2 unless otherwise specified) Non-Inverting Frequency Response Inverting Frequency Response Frequency Response for Various Load Resistances Open-Loop Gain and Phase vs Frequency Output Voltage Swing vs Frequency Equivalent Input Noise CMRR PSRR and Closed-Loop Output Resistance vs Frequency 2nd and 3rd Harmonic Distortion vs Frequency Settling Time vs Output Voltage Change Supply Current vs Supply Voltage Common-Mode Input Range vs Supply Voltage Output Voltage Range vs Supply Voltage

6 EL2245CEL2445C Typical Performance Curves (T A e 25C R F e 1kXC F e3 pf R L e 1000X A V ea2 unless otherwise specified) Contd Gain-Bandwidth Product vs Supply Voltage Open-Loop Gain vs Supply Voltage Slew-Rate vs Supply Voltage Bias and Offset Current vs Input Common-Mode Voltage Open-Loop Gain vs Load Resistance Voltage Swing vs Load Resistance Offset Voltage vs Temperature Bias and Offset Current vs Temperature Supply Current vs Temperature Gain-Bandwidth Product vs Temperature Open-Loop Gain PSRR and CMRR vs Temperature Slew Rate vs Temperature

7 EL2245CEL2445C Typical Performance Curves (T A e 25C R F e 1kXC F e3 pf R L e 1000X A V ea2 unless otherwise specified) Contd Short-Circuit Current vs Temperature Gain-Bandwidth Product vs Load Capacitance Overshoot vs Load Capacitance Small-Signal Step Response Large-Signal Step Response Differential Gain and Phase vs DC Input Offset at 358 MHz Differential Gain and Phase vs DC Input Offset at 443 MHz Differential Gain and Phase vs Number of 150X Loads at 358 MHz Differential Gain and Phase vs Number of 150X Loads at 443 MHz 8-Pin Plastic DIP Maximum Power Dissipation vs Ambient Temperature 8-Lead SO Maximum Power Dissipation vs Ambient Temperature

8 EL2245CEL2445C Typical Performance Curves (T A e 25C R F e 1kXC F e3 pf R L e 1000X A V ea1 unless otherwise specified) Contd 14-Pin Plastic DIP Maximum Power Dissipation vs Ambient Temperature 14-Lead SO Maximum Power Dissipation vs Ambient Temperature Channel Separation vs Frequency Simplified Schematic (Per Amplifier) Burn-In Circuit (Per Amplifier) All Packages Use the Same Schematic 8

9 EL2245CEL2445C Applications Information Product Description The EL2245CEL2445C are dual and quad lowpower wideband monolithic operational amplifiers built on Elantec s proprietary high-speed complementary bipolar process The EL2245C EL2445C use a classical voltage-feedback topology which allows them to be used in a variety of applications where current-feedback amplifiers are not appropriate because of restrictions placed upon the feedback element used with the amplifier The conventional topology of the EL2245C EL2445C allows for example a capacitor to be placed in the feedback path making it an excellent choice for applications such as active filters sample-and-holds or integrators Similarly because of the ability to use diodes in the feedback network the EL2245CEL2445C are an excellent choice for applications such as fast log amplifiers Power Dissipation With the wide power supply range and large output drive capability of the EL2245CEL2445C it is possible to exceed the 150C maximum junction temperatures under certain load and powersupply conditions It is therefore important to calculate the maximum junction temperature (T Jmax ) for all applications to determine if power supply voltages load conditions or package type need to be modified for the EL2245CEL2445C to remain in the safe operating area These parameters are related as follows T Jmax e T max a (i JA (PDmaxtotal)) where PDmaxtotal is the sum of the maximum power dissipation of each amplifier in the package (PDmax) PDmax for each amplifier can be calculated as follows PDmaxe (2V S I Smax a(v S bv outmax )(V outmax R L )) where T max e Maximum Ambient Temperature i JA e Thermal Resistance of the Package PDmax e Maximum Power Dissipation of 1 Amplifier V S e Supply Voltage I Smax e Maximum Supply Current of 1 Amplifier V outmax e Maximum Output Voltage Swing of the Application R L e Load Resistance To serve as a guide for the user we can calculate maximum allowable supply voltages for the example of the video cable-driver below since we know that T Jmax e 150C T max e 75C I Smax e 76 ma and the package i JA s are shown in Table 1 If we assume (for this example) that we are driving a back-terminated video cable then the maximum average value (over duty-cycle) of V outmax is 14V and R L e 150X giving the results seen in Table 1 Table 1 Max PDiss Duals Package i JA T max Max V S EL2245CN PDIP8 95CW 0789W 75C g166v EL2245CS SO8 150CW 0500W 75C g107v QUADS EL2445CN PDIP14 70CW 1071W 75C g115v EL2445CS SO14 110CW 0682W 75C g75v Single-Supply Operation The EL2245CEL2445C have been designed to have a wide input and output voltage range This design also makes the EL2245CEL2445C an excellent choice for single-supply operation Using a single positive supply the lower input voltage range is within 100 mv of ground (R L e 500X) and the lower output voltage range is within 300 mv of ground Upper input voltage range reaches 42V and output voltage range reaches 38V with a 5V supply and R L e 500X This results in a 35V output swing on a single 5V supply This wide output voltage range also allows single-supply operation with a supply voltage as high as 36V or as low as 25V On a single 25V supply the EL2245CEL2445C still have 1V of output swing Gain-Bandwidth Product and the b3 db Bandwidth The EL2245CEL2445C have a gain-bandwidth product of 100 MHz while using only 52 ma of supply current per amplifier For gains greater 9

10 EL2245CEL2445C Applications Information Contd than 4 their closed-loop b3 db bandwidth is approximately equal to the gain-bandwidth product divided by the noise gain of the circuit For gains less than 4 higher-order poles in the amplifiers transfer function contribute to even higher closed loop bandwidths For example the EL2245C EL2445C have a b3 db bandwidth of 100 MHz at a gain of a2 dropping to 20 MHz at a gain of a5 It is important to note that the EL2245C EL2445C have been designed so that this extra bandwidth in low-gain applications does not come at the expense of stability As seen in the typical performance curves the EL2245C EL2445C in a gain of a2 only exhibit 10 db of peaking with a 1000X load Video Performance An industry-standard method of measuring the video distortion of components such as the EL2245CEL2445C is to measure the amount of differential gain (dg) and differential phase (dp) that they introduce To make these measurements a 0286 V PP (40 IRE) signal is applied to the device with 0V DC offset (0 IRE) at either 358 MHz for NTSC or 443 MHz for PAL A second measurement is then made at 0714V DC offset (100 IRE) Differential gain is a measure of the change in amplitude of the sine wave and is measured in percent Differential phase is a measure of the change in phase and is measured in degrees For signal transmission and distribution a backterminated cable (75X in series at the drive end and 75X to ground at the receiving end) is preferred since the impedance match at both ends will absorb any reflections However when double termination is used the received signal is halved therefore a gain of 2 configuration is typically used to compensate for the attenuation The EL2245CEL2445C have been designed as an economical solution for applications requiring low video distortion They have been thoroughly characterized for video performance in the topology described above and the results have been included as typical dg and dp specifications and as typical performance curves In a gain of a2 driving 150X with standard video test levels at the input the EL2245CEL2445C exhibit dg and dp of only 002% and 007 at NTSC and PAL Because dg and dp can vary with different DC offsets the video performance of the EL2245C EL2445C has been characterized over the entire DC offset range from b0714v to a0714v For more information refer to the curves of dg and dp vs DC Input Offset Output Drive Capability The EL2245CEL2445C have been designed to drive low impedance loads They can easily drive 6V PP into a 150X load This high output drive capability makes the EL2245CEL2445C an ideal choice for RF IF and video applications Furthermore the current drive of the EL2245C EL2445C remains a minimum of 35 ma at low temperatures The EL2245CEL2445C are current-limited at the output allowing it to withstand shorts to ground However power dissipation with the output shorted can be in excess of the power-dissipation capabilities of the package Capacitive Loads For ease of use the EL2245CEL2445C have been designed to drive any capacitive load However the EL2245CEL2445C remain stable by automatically reducing their gain-bandwidth product as capacitive load increases Therefore for maximum bandwidth capacitive loads should be reduced as much as possible or isolated via a series output resistor (Rs) Similarly coax lines can be driven but best AC performance is obtained when they are terminated with their characteristic impedance so that the capacitance of the coaxial cable will not add to the capacitive load seen by the amplifier Although stable with all capacitive loads some peaking still occurs as load capacitance increases A series resistor at the output of the EL2245CEL2445C can be used to reduce this peaking and further improve stability Printed-Circuit Layout The EL2245CEL2445C are well behaved and easy to apply in most applications However a few simple techniques will help assure rapid high quality results As with any high-frequency device good PCB layout is necessary for optimum 10

11 Applications Information Contd performance Ground-plane construction is highly recommended as is good power supply bypassing A 01 mf ceramic capacitor is recommended for bypassing both supplies Lead lengths should be as short as possible and bypass capacitors should be as close to the device pins as possible For good AC performance parasitic capacitances should be kept to a minimum at both inputs and at the output Resistor values should be kept under5kxbecause of the RC time constants associated with the parasitic capacitance Metal-film and carbon resistors are both acceptable use of wire-wound resistors is not recommended because of their parasitic inductance Similarly capacitors should be low-inductance for best performance Connections ainput l binput l l avsupply EL2245CEL2445C The EL2245CEL2445C Macromodel This macromodel has been developed to assist the user in simulating the EL2245CEL2445C with surrounding circuitry It has been developed for the PSPICE simulator (copywritten by the Microsim Corporation) and may need to be rearranged for other simulators It approximates DC AC and transient response for resistive loads but does not accurately model capacitive loading This model is slightly more complicated than the models used for low-frequency op-amps but it is much more accurate for AC analysis The model does not simulate these characteristics accurately noise settling-time CMRR PSRR Poles ep rpa l l l bvsupply cpa pF l l l l output rpb l l l l l cpb pF subckt M Input stage ie7371ma r r rc rc q130336qp q qpa ediff rdiff Meg Compensation Section ga m rh Meg ch pF rc K cc pF non-linearities temperature effects manufacturing variations Output Stage ios mA ios mA q344350qp q474351qn q575052qn q645153qp ros ros Power Supply Current ips mA Models model qn npn(ise800eb18 bfe200 tfe02ns) model qpa pnp(ise864eb18 bfe100 tfe02ns) model qp pnp(ise800eb18 bfe125 tfe02ns) ends TAB WIDE TD is 36in TD is 36in 11

12 EL2245CEL2445C EL2245CEL2445C EL2245CEL2445C Macromodel Contd EL2245CEL2445C Model General Disclaimer Specifications contained in this data sheet are in effect as of the publication date shown Elantec Inc reserves the right to make changes in the circuitry or specifications contained herein at any time without notice Elantec Inc assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement December 1995 Rev C Elantec Inc 1996 Tarob Court Milpitas CA Telephone (408) (800) Fax (408) European Office WARNING Life Support Policy Elantec Inc products are not authorized for and should not be used within Life Support Systems without the specific written consent of Elantec Inc Life Support systems are equipment intended to support or sustain life and whose failure to perform when properly used in accordance with instructions provided can be reasonably expected to result in significant personal injury or death Users contemplating application of Elantec Inc products in Life Support Systems are requested to contact Elantec Inc factory headquarters to establish suitable terms conditions for these applications Elantec Inc s warranty is limited to replacement of defective components and does not cover injury to persons or property or other consequential damages Printed in USA